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DTC 01-21 ROM Error; DTC 01-22 RAM Error: Description

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTION CONDITION CHART

DTC No. DTC Detection Condition Trouble Area
01-21 A malfunction exists in ROM Multi-display
01-22 A malfunction exists in RAM
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